fix: remove all marks when noone speaks next

if room comes to a state where last person stopped speaking,
then setting room to clean state is logical,
next person to start speaking is the only reference point

rooms/room.go

@@ -53,6 +53,7 @@ func (r *Room) RaiseHand(p PersonId, gesture HandGesture) Room {
 // - we should find next speaker
 // - assign room.CurrentSpeaker to next speaker or to PersonId(0) to indicate that noone is speaking
 // - if next speaker has gesture of higher priority - set Mark to current speaker for their gesture level
+// when there is not next speaker, remove all marks
 func (r *Room) ReleaseHand(p PersonId) {
 	// releasing a hand of a current speaker should result in selection of a new speaker
 	log.Printf("about to release hand of %d in %+v", p, r)
@@ -76,6 +77,7 @@ func (r *Room) ReleaseHand(p PersonId) {
 	if !nextSpeakerFound {
 		log.Printf("there is not next speaker, that's ok")
 		r.CurrentSpeaker = PersonId(0)
+		r.Marks = make(map[HandGesture]PersonId)
 	} else {
 		// searching for the next speaker
 		currentSpeakerGesture := handReleaseGesture

rooms/room_release_hand_test.go

@@ -20,6 +20,7 @@ var releaseHandTests = []releaseHandTest{
 	releasingNonSpeakerHand,
 	releaseToPersonWithHandAndMark,
 	raisingLevelSetMarksWithoutOverridingExisting,
+	releaseAllMarksWhenNoSpeaker,
 }
 
 func TestRoomReleaseHand(t *testing.T) {
@@ -314,3 +315,40 @@ var releaseToPersonWithHandAndMark releaseHandTest = releaseHandTest{
 		Marks: map[HandGesture]PersonId{},
 	},
 }
+
+// there is a mark for Expand on person 2, mark for Change Topic on person 3
+// speaker is person 1 with Expand
+// after hand release person nobody should be speaking, with all marks removed
+var releaseAllMarksWhenNoSpeaker releaseHandTest = releaseHandTest{
+	testName: "releaseAllMarksWhenNoSpeaker",
+	room: Room{
+		Name:           "test",
+		CurrentSpeaker: person1.Id,
+		Paricipants: []PersonId{
+			person1.Id,
+			person2.Id,
+			person3.Id,
+			person4.Id,
+		},
+		ParticipantHands: map[PersonId]HandGesture{
+			person1.Id: Expand,
+		},
+		Marks: map[HandGesture]PersonId{
+			Expand: person2.Id,
+			ChangeTopic: person3.Id,
+		},
+	},
+	releasingParticipantId: person1.Id,
+	expected: Room{
+		Name:           "test",
+		CurrentSpeaker: PersonId(0),
+		Paricipants: []PersonId{
+			person1.Id,
+			person2.Id,
+			person3.Id,
+			person4.Id,
+		},
+		ParticipantHands: map[PersonId]HandGesture{},
+		Marks: map[HandGesture]PersonId{},
+	},
+}